[PATCH] hfs: use kzalloc in hfs_find_init() to fix KMSAN bug

[Gianfranco Trad <gianf.trad@gmail.com>]

Syzbot reports KMSAN uninit-value use in hfs_free_fork [1].
Use kzalloc() instead of kmalloc() to zero-init fd->search_key
in hfs_find_init() in order to mitigate such KMSAN bug.

[1] https://syzkaller.appspot.com/bug?extid=2e6fb1f89ce5e13cd02d

Reported-by: syzbot+2e6fb1f89ce5e13cd02d@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=2e6fb1f89ce5e13cd02d
Tested-by: syzbot+2e6fb1f89ce5e13cd02d@syzkaller.appspotmail.com
Signed-off-by: Gianfranco Trad <gianf.trad@gmail.com>
---

Notes: since there's no maintainer for hfs I included Andrew as stated
in the Documentation. I also considered to include the top 2 commiters
to hfs subsytem given by scripts/get_maintainers.pl. Hope it's not a
problem, if so apologies.

 fs/hfs/bfind.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfs/bfind.c b/fs/hfs/bfind.c
index ef9498a6e88a..c74d864bc29e 100644
--- a/fs/hfs/bfind.c
+++ b/fs/hfs/bfind.c
@@ -18,7 +18,7 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
 
 	fd->tree = tree;
 	fd->bnode = NULL;
-	ptr = kmalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
+	ptr = kzalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
 	if (!ptr)
 		return -ENOMEM;
 	fd->search_key = ptr;
-- 
2.43.0